Gin pole



Manjch 3, 1942. H. J. MARTIN GIN POLE Filed July 3, 1940 2 Sheets-Sheet 1 Y Mem: 1 .fa/:0105 J//Zdfzjb Magg March 3, 1942. H. J. MARTIN GIN POLE Filed July 3, 1940 2 Sheets-Sheet 2 mit/agg PatentedA Mar.' 3, 1942 GIN POLE Harold J. Martin, Chicago, Ill., assigner to The L. E. Myers Co., Chicago, Ill., a corporation of Delaware Application July 3, 1940, Serial No. 343,752

3 Claims.

The invention relates to improvements in gin poles adapted for use in simple hoisting operations in the field, the primary object of the invention being the provision of a simple and effective construction of the character indicated, so arranged and mounted as to be capable of ready transportation and quick erection and use in the field, and which is of simple construction and highly eihcient in use.

Other objects will appear hereinafter.

The invention consists of the combinations and arrangements of parts hereinafter described and claimed.

The inventionwill be best understood by reference to the accompanying drawings forming a part of this specication and in which:

Fig. l is a side elevation of a gin pole arrangement embodying the invention;

Fig. 2, an enlarged side View, shown partially in section, of the upper end of the gin pole;

Fig. 3, a plan view of a guy bracket employed at the top of the pole;

Fig. 4, an enlarged transverse section taken substantially on line 4--4 of Fig. l;

Fig. 5, a section taken substantially on line 5-5 of Fig. 4;

Fig. 6, a transverse section taken substantially on line 6 6 of Fig. 4;

Fig. 7, an enlarged partial side View of the medial portion of the gin pole; and

Fig. 8, a view taken at right angles to Fig. 7.

The embodiment of the invention illustrated in the drawings comprises a truck body ID of any usual or desired construction, and running at one end on caterpillars II. The other end .of the body I is connected with a caterpillar tractor I2 equipped with a suitable engine I3 as indicated.

A base member in the form of a transverse pipe or tube section I4 is mounted transversely of the truck body I3 the ends of said base member being provided with cuffs or collars I5 resting in the ends of a channelled support I6 and iirrnly held therein by means of U-bolts I1 as shown. A U-shaped bracket I8 is arranged as indicated to embrace the base member I4 and the lower end of a tubular gin pole section I9 is pivotally secured in the bracket I8 by means of pivot bolt 2l] whereby said gin pole section is pivotally mounted on the truck I0 to swing in either direction, the lower end 2l of said section vbeing rounded as shown to facilitate such pivoting.

An upper tubular gin pole section 2?. is arranged as shown to i'it within and telescope with the section I9, the upper end of the section I9y being provided with a guide ring 23, to hold the section 22 centrally within it. The lower end of section 22 is also provided with a guide ring 24 for the same purpose and cable sections 2t are secured as shown to the guide ring 24. The cable sections 25 pass upwardly and outwardly through slots 2t in the sides of the section i9 and thence over guide pulleys 2l mounted in brackets 28 on the sides of said section. The lower ends of the section 25 are then brought together and secured to a clamp 29 to form a lifting bridle for the upper section 2.., as will be readily understood. Lifting cable 3B is secured to the clamp 29 and passes downwardly under a guide pulley 3I mounted on the bracket I8 and thence to a hand winch 32 mounted on the truck as shown. By this arrangement, it will be noted, that the upper gin pole section 22 may be readily elevated cr lowered when the lower section 9 is upright. An additional guide pulley 33 is arranged as shown on the bracket I3 to facilitate the use of another cable or rope and-other lifting or lowering means for manipulating the upper section 22 when desired.

A raising cable 34 has one of its ends anchored at 35 to the lower section I and passes thence over a double floating pulley block 35, a stationary double pulley block 3T 4and a guide pulley 3B on a supporting frame 38' to a double hoisting drum 39 on the tractor l2 and operable in the usual way from the engine I3 whereby the lower gin pole section I9 may be readily raised into upright position or lowered into substantially horizontal position when desired. Suitable hooks 40 are 7 provided on the sides oi the section I9 for the attachment of guy ropes or cables to hold and brace the section in its upright position.

A four-armed bracket 4I is arranged as shown at the top of the upper section 22 for the connection of guy ropes or cables 42 ior further securing the gin pole in its raised and extended position. A stop ring 43 is also provided near the top of the upper section 22 to limit the descent or telescoping action of the upper section in the lower section I9.

A supporting ring 24 is secured as shown in the top of the section 22 and provided with an upstanding nipple d on which is swivelled a supporting head 46 mounted to rotate freely on ball bearings 4i. The supporting head 46 is provided with a laterally and upwardly extending bracket 48 supporting a guide pulley 49 over which passes a hoisting cable 5D provided at its end with the usual hoisting hook 5I. The hoisting cable 50 extends downwardly through the interior of the 'sections 22 and I9 and then outwardly under a guide pulley 5| supported on a bracket 52 secured as shown to the lower portion of the section I9 and thence to the hoisting drum 39 on the truck l2 as indicated.

By this arrangement, a gin pole construction is provided which may be readily telescoped and lowered for convenience in transportation, and quickly extended into substantially Vertical position for use in the eld and which is capable of economical production and highly ecient in use. The specific form and arrangement of parts is a simple and effective one for the purpose.

While I have illustrated and described the preierred form of construction for carrying the in vention into effect, this is capable of Variation and modification without departing from the spirit of the invention. I therefore do not wish to be limited to the precise details disclosed, but desire to avail myself of such variations and modifications as fall within the scope of the appended claims.

I claim:

1. The combination of a truck body; a support in the form of a channel arranged transversely of said body; a tubular base member resting in the channel of said support; U-bolts clamping the ends of said base member in said support; a substantially U-shaped bracket embracing the central portion of said base member with its sides projecting upwardly; a gin pole having its lower end pivotally mounted between said bracket sides; and means on said truck for raising and lowering said gin pole.

2. A gin pole comprising a tubular base member; a U-shaped bracket pivotally embracing said member; a tubular lower pole section pivotally mounted in said bracket; a tubular upper pole section slidably mounted in said lower section; guide pulleys arranged diametrically at the top of said lower pole section, there being slots in the sides of the lower pole section registering with said pulleys; two cable sections secured to the lower end of said upper pole section and passing outwardly through said slots and downwardly over said pulleys, said cable sections being secured together at their lower ends to form a bridle; a cable attached to said bridle; a guide pulley mounted on said U-shaped bracket and said last mentioned cable passing thereunder; an upwardly extending nipple connected with the top of said upper pole section; a supporting head swivelled on said nipple; a pulley bracket on said supporting head carrying a guide pulley; a hoisting cable passing over said last mentioned guide pulley and downwardly through said nipple and pole sections, there being a slot in the side of saidlower pole section near its bottom; and a bracket secured to said lower pole section and carrying a guide pulley registering with said last mentioned slot, said hoisting cable passing outwardly through said last mentioned slot and under said last mentioned guide pulley.

3. The combination with a support, of a tubular lower pole section pivotally mounted on said support and having a stop ring secured around the inside of its top; means for pivotally adjusting said pole section on said support; an upper pole section sliding within said lower section and projecting from the top thereof; a stop ring secured around the outside of said upper pole section at its bottom and arranged to co-operate with the stop ring at the top of said lower pole section; guide pulleys arranged diametrically at the top of said lower pole section; two cable sections secured to the ring at the lower end of said upper section and passing outwardly and downwardly over said pulleys, said cable sections being secured together at their lower ends to form a bridle; a raising cable connectedv with said bridle forlowering and raising said upper pole section; and a hoisting cable operatively mounted on said pole sections.

HAROLD J. MARTIN. 

